Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ee1ed9a4b4c8f7d9…

MALICIOUS

Office (OOXML)

89.2 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000
MD5: a14c602ef5e6d17029039431c9b3ee5e SHA-1: 11dade4f2b4459edc9300ee1ae16c7fb045cd4bb SHA-256: ee1ed9a4b4c8f7d93d54a95cdc82f64cecf7464dcac477339883717caf8426ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Excel document containing a Workbook_Open macro that executes a shell command. The macro constructs a string from cell values and environment variables, then writes it to a file named '//theWBATWorksheet.sct' in the ALLUSERSPROFILE directory, which is then executed using 'mshta'. This indicates a macro-based downloader designed to execute a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f4483fe42a818a2f218df16bc5ae43445bfb8e199cd599c3b8b65323c491dda5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1912 bytes
vbaProject_00.bin
15d3d9f45794e9650fbfce1bff0a31a79b8ed2c179ca0aefffac4dfaf13115b1		 vba-project OOXML VBA project: xl/vbaProject.bin 13824 bytes

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